“In this tutorial I am going to explain how I made the image of the Parthenon. I have seen many different photographs and drawings of the Parthenon from different angles, in order to have an idea, as clear as possible, about its characteristics and proportions. I have obtained a lot of information from several books of History and Art.”
http://www.cgarena.com/freestuff/tutorials/ruinschallenge/parthenon/index.html